From ab66e906cc95988db26332d06f0bdae9d795349c Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Mon, 30 Sep 2013 07:21:52 -0400
Subject: Don't divide by zero if nothing to report. #250.

---
 coverage/xmlreport.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'coverage/xmlreport.py')

diff --git a/coverage/xmlreport.py b/coverage/xmlreport.py
index 301bc865..78375249 100644
--- a/coverage/xmlreport.py
+++ b/coverage/xmlreport.py
@@ -85,7 +85,12 @@ class XmlReporter(Reporter):
         outfile.write(self.xml_out.toprettyxml())
 
         # Return the total percentage.
-        return 100.0 * (lhits_tot + bhits_tot) / (lnum_tot + bnum_tot)
+        denom = lnum_tot + bnum_tot
+        if denom == 0:
+            pct = 0.0
+        else:
+            pct = 100.0 * (lhits_tot + bhits_tot) / denom
+        return pct
 
     def xml_file(self, cu, analysis):
         """Add to the XML report for a single file."""
-- 
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